<?php
declare(strict_types=1);

use App\App;
use App\CalendarSync;

$app = App::get();
$token = trim((string)($_GET['token'] ?? ''));

if ($token === '') {
    http_response_code(400);
    header('Content-Type: text/plain; charset=utf-8');
    echo 'Token fehlt.';
    return;
}

$calendarSync = new CalendarSync($app);
$calendarSync->ensureSchema();

$userId = $calendarSync->findUserIdByFeedToken($token);
if (!$userId) {
    http_response_code(404);
    header('Content-Type: text/plain; charset=utf-8');
    echo 'Kalender-Feed nicht gefunden.';
    return;
}

$calendarSync->touchFeedAccess($userId);
$ics = $calendarSync->renderUserCalendarIcs($userId, 'Papa-Kind-Treff Events');

header('Content-Type: text/calendar; charset=utf-8');
header('Content-Disposition: inline; filename="papa-kind-treff-events-feed.ics"');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');

echo $ics;